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Disable TSX on some Haswell processors.

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Patch disables Intel TSX on some Haswell processors to avoid TSX
on kernels that weren't updated with the latest microcode package
(which disables broken feature by default).

    * sysdeps/x86/cpu-features.c (get_common_indeces): Add
    stepping identification.
    (init_cpu_features): Add handle of Haswell.
This commit is contained in:
Andrew Senkevich 2016-12-19 13:20:31 +03:00
parent 7051390094
commit 2702856bf4
2 changed files with 29 additions and 6 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2016-12-19 Andrew Senkevich <andrew.senkevich@intel.com>
* sysdeps/x86/cpu-features.c (get_common_indeces): Add
stepping identification.
(init_cpu_features): Add handle of Haswell.
2016-11-25 Jim Meyering <meyering@fb.com>
[BZ #20386]

29
sysdeps/x86/cpu-features.c
View File

@ -22,7 +22,7 @@
static void
get_common_indeces (struct cpu_features *cpu_features,
unsigned int *family, unsigned int *model,
unsigned int *extended_model)
unsigned int *extended_model, unsigned int *stepping)
{
if (family)
{
@ -34,6 +34,7 @@ get_common_indeces (struct cpu_features *cpu_features,
*family = (eax >> 8) & 0x0f;
*model = (eax >> 4) & 0x0f;
*extended_model = (eax >> 12) & 0xf0;
*stepping = eax & 0x0f;
if (*family == 0x0f)
{
*family += (eax >> 20) & 0xff;
@ -116,11 +117,12 @@ init_cpu_features (struct cpu_features *cpu_features)
/* This spells out "GenuineIntel". */
if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
{
unsigned int extended_model;
unsigned int extended_model, stepping;
kind = arch_kind_intel;
get_common_indeces (cpu_features, &family, &model, &extended_model);
get_common_indeces (cpu_features, &family, &model, &extended_model,
&stepping);
if (family == 0x06)
{
@ -201,6 +203,20 @@ init_cpu_features (struct cpu_features *cpu_features)
| bit_arch_Fast_Unaligned_Copy
| bit_arch_Prefer_PMINUB_for_stringop);
break;
case 0x3f:
/* Xeon E7 v3 with stepping >= 4 has working TSX. */
if (stepping >= 4)
break;
case 0x3c:
case 0x45:
case 0x46:
/* Disable Intel TSX on Haswell processors (except Xeon E7 v3
with stepping >= 4) to avoid TSX on kernels that weren't
updated with the latest microcode package (which disables
broken feature by default). */
cpu_features->cpuid[COMMON_CPUID_INDEX_7].ebx &= ~(bit_cpu_RTM);
break;
}
}
@ -227,11 +243,12 @@ init_cpu_features (struct cpu_features *cpu_features)
/* This spells out "AuthenticAMD". */
else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
{
unsigned int extended_model;
unsigned int extended_model, stepping;
kind = arch_kind_amd;
get_common_indeces (cpu_features, &family, &model, &extended_model);
get_common_indeces (cpu_features, &family, &model, &extended_model,
&stepping);
ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
@ -268,7 +285,7 @@ init_cpu_features (struct cpu_features *cpu_features)
else
{
kind = arch_kind_other;
get_common_indeces (cpu_features, NULL, NULL, NULL);
get_common_indeces (cpu_features, NULL, NULL, NULL, NULL);
}
/* Support i586 if CX8 is available. */